Astell & Kern SR25 Digital Audio Player

Description

The Astell & Kern SR25 is the second model in the Astell&Kern A&norma standard line.

Beginning with the AK70, Astell&Kern’s goal was to bring high resolution audio and the Astell&Kern sound to more music lovers.
This goal continued with the successor to the AK70, the A&norma SR15, and now evolves further as the SR25, a premium product that fully embraces Astell&Kern’s philosophy and technology, now available to the masses.

The Astell & Kern SR25 is the latest answer to our never-ending question of “How do we get closer to the original sound the artist intended?”

The SR25 improves on the SR15 by:

Adding a new, faster Quad-Core CPU paired with the Dual Cirrus Logic CS43198 Master Hi-Fi level DAC, first used on the SR15
Native playback support for DSD256
A new class-leading performance mode for ultra-high quality playback without compromise
Newly designed circuitry to improve sound quality enhancements
Addition of Bluetooth LDAC codec to give users more options for higher quality wireless sound

The essence of Astell&Kern’s philosophy that sound quality is never compromised is exemplified in the SR25,
which expresses every musical detail and bit-perfect playback as only Astell&Kern can.

Technical Specification

General Specifications
Model: SR25
Body Color: Moon Silver
Body Material: Aluminum
Display: 3.6inch WVGA (720 x 1,280) TFT LCD
Supported Audio Formats: WAV, FLAC, WMA, MP3, OGG, APE, AAC, ALAC, AIFF, DFF, DSF, MQA
MQA playback: Services(Tidal Masters), Local files, External USB, MQA-CD(ripped)
Sample rate: PCM : 8kHz ~ 384kHz (8/16/24/32bits per Sample) / DSD Native: DSD64(1bit 2.8MHz), Stereo
/ DSD128(1bit 5.6MHz), Stereo / DSD256(1bit 11.2MHz), Stereo
Output Level: Unbalanced 2.0Vrms / Balanced 4.0Vrms (Condition No Load)
DAC: Cirrus Logic CS43198 x2 (Dual DAC)
CPU: Quad-Core
Decoding: Support up to 32bit / 384kHz Bit-to-Bit Playback
Input: USB Type-C input (for PC & MAC)
Outputs: Unbalanced Out (3.5mm) / Balanced Out (2.5mm, only 4-pole supported)
Wi-Fi: 802.11 b/g/n (2.4GHz)
Bluetooth: V4.2 (A2DP, AVRCP, aptXTM HD, LDAC)
Dimensions: 2.5 ”(63.5 mm) x 4.26 ”(108.3 mm) x 0.63 ”(16.1 mm)
Weight: about 6.27 oz (about 178 g)
Feature Enhancements: Firmware upgrades supported (OTA)
Audio Performance
Frequency Response: ±0.014dB (Condition: 20Hz~20kHz) Unbalanced / ±0.011dB (Condition: 20Hz~20kHz) Balanced
±0.10dB (Condition: 20Hz~70kHz) Unbalanced / ±0.12dB (Condition: 20Hz~70kHz) Balanced
Signal to Noise Ratio: 122dB @ 1kHz, Unbalanced / 123dB @ 1kHz, Balanced
Crosstalk: -138dB @ 1kHz, Unbalanced / -144dB @ 1kHz, Balanced
THD+N: 0.0007% @ 1kHz, Unbalanced / 0.0008% @ 1kHz, Balanced
IMD SMPTE: 0.0004% 800Hz 10kHz(4:1) Unbalanced / 0.0003% 800Hz 10kHz(4:1) Balanced
Output Impedance: Unbalanced Out 3.5mm (1.8ohm) / Balanced out 2.5mm (1.6ohm)
Clock source
Clock Jitter: 25ps(Typ)
Reference Clock Jitter: 200 Femto Seconds
Battery
Capacity: 3,150mAh 3.7V Li-Polymer Battery
Continuous Playback Time: About 21 hours (Standard – MUSIC: FLAC, 16-bit/44.1kHz, Unbalance, Volume 50, EQ OFF, LCD OFF)
Charge Time: About 2.5 hours (Standard – 5V/2A Charging)
Memory
Built-in Memory: 64GB
External Memory: microSD (Max. 1TB) x1
OS
Supported OS: Windows 7,8,10 (32/64bit), MAC OS X 10.7 and up